SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3baab5c9e4cd373c841914e0c62cddb00f89e8d0c4df8f3ec3acf465e0ef5a' 
  AND token = 'sucAFasipeNw7YcTsYzIhDwTTsqoGmnpBfXYr71wnbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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