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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b92c1f93f4db43f8bc467de782812829f59e37baddfbc5cf6a61ffcefb2b44' 
  AND token = 'cULH5LX0z0fTzIpd4dvoMbjPuCWqzhA6eN97UxUDeG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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