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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69f2e42c4b90433a619192fb77aae7009e5269e48f137b87d8b6f4e0210d1dc' 
  AND token = '92IP+e/VyxI+CdqImqoK9Yz8S/M0Q+enAlVE6EMOyYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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