SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af227c312cdf5d94fbbfa7620d2cc7f328e2af960f538d4ed1589ea453378a1' 
  AND token = 'hFwFOXY2eRv1O9BeKw3EViWMxGeh5ID8OSJvDIwzZFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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