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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5919de7257a72e6018084e0502bbceb06754c20c2ee58b5eec6cea53e4c9a798' 
  AND token = 'KUlwbjn87MseDbQrF23i2UEaE7ZYoXqv05fYuWEFtyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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