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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da611131817440d34c8f3a60d586e8855ae0e99a845961c7a20bd75a368d4530' 
  AND token = 'J0WKcr9SHjSbtREGxjDtsqeVbfAneRpZ3UhzAT21QGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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