Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ffa16d93dcf86dd77cebd5947703f566d3b4da37fdddd89aa79f027c77ce36' 
  AND token = 'vXDaqPa9znwGo97xI8FoxCZvEDs3RByFty61SumtkrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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