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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ebf7fde4c6c59f4983861ccf1e473cd335ea46cdddb87fbb4b159ea45efb7d' 
  AND token = 'S62PCkUNmKT0Dj3Qf3l9zXBz9jalXKxm57PAIriIzSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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