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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69fbc31483bfc9ff59bfb7c8d1d7d70042b2e84557a7bc08e3ebcd80ddfc7aa' 
  AND token = 'AyYhtNRTp0jlNmW1rzUhqIs93v7R/cwK+H4tb3DXRSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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