SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807ce2cbadd5f6452af38788005ee8af420179ddbb69a99cf689217d15b4fd1d' 
  AND token = 'b7qxMU9+kqkh4B/z7cJYKV/LOWZJfGcyizpjrPxxeWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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