Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5703f42a118324d759174388d819ea8179fcfc841843c58585da447a36afde7' 
  AND token = 'dRAUKvj1D8OYY2wMztqEsP3sSX+/lGCyoKcc3aOaoUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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