Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97b60a8f98c5f10b676bb3aebe20549a94029b2faaabdb11ef40cefa7d7a1c6' 
  AND token = 'ceF06f05c+PxgzNFVF64rs7ZKWRFiZf5GJtiSU3rB7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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