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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998f750d6f017654f5fcb50f69feb9420a558317e3e099d5c372e3dc457e8d32' 
  AND token = 'rR8X5kORAd+RHcspSPxtnKc/fB0wIlQqD1tcajWeoi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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