SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29cae836d8ef950bcc2ade0d5c418165f4c455b256b7e143967a4372c0b5856' 
  AND token = 'hx81qW/iW9nQbLNMmNJ4ZKmEIUtfzHa7s58COELAwYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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