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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194dbe82cde7f9971a9ca0e5087f1b4f30432546ca94791ca8c9c8bebbc73177' 
  AND token = 'vbp7k5jK57f2a6vuOHnIQFi4wNdZ/SaBDggO7ZrDtBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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