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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285ed8aa0fd86054be6a375ebcefdf86ff3f5c6f6f574a9fdfe066636413d407' 
  AND token = 'MtRLg0ZuluA9plJIqeNbSPVVz10tNvBxPwWd2C4ivL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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