Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f9ecc7918b26fc4bfee5a55d1ca9b955b15ae386a06dfaa69421fd6375fd0c' 
  AND token = 'MxA1lWFNV0si/IROFBmTVXwwETildOT7aGRuI+TNnM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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