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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ada6c8baf31d318be8f36c6cc61a9dcaf5e70a65c1236be988cef7897b9bc5' 
  AND token = 'oVZuF0eupvUk5zhzjWX683s5yH6tM2GU/pz3lQAn4GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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