Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c1c82f2f0765cef1aaddf975e83047e5de62c65752edc61086395e261e9655' 
  AND token = 'elzKl7NAnZAXf6Negv0K29A2KoTRJLseWQlK4+eS+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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