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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5864f8956bed44042ad21ed3f06f71746f97a61d07f92506e46f7c0c08eb92' 
  AND token = 'ePeVSbuG76u3m1yGA7g/+L61jv+fKIvylr0XlOXcCJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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