SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14eecf21d6b1d656d82ae54908fce3f338577984ed3b696b87240575160d11e' 
  AND token = 'r8AQT0kToV1XmLAB+BPl2gaNQV/+FN0cYkzLkmKuVvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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