Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfc155552eeb5fe064c314301537e457306df729c53d9363d490496e92d82db' 
  AND token = 'IBgroTrYldOt5MzQ3XvL2kKUNSZ9Ct5l+8lm8V+3fuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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