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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9298383390cd596dfe5e885e48c5a923537bbc0718df4fb1da04999398f966e3' 
  AND token = 'GaJ0lJPb5fHC/j9iEcmXTzi7P9LUINR8MPc70Epm4rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}