Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554225d57eb2a475bd2c96a0250bdbb85e86e70a3be6c5260b950f2d50688c4b' 
  AND token = 'NOBoek/Lh+kOe2Srq2FUuTOcwCJtUqDfgh/DPeJvNFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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