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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467309aaa43a884915108a362684d2233f5dd1f2738afc8ab05c540f73320fa0' 
  AND token = 'UlNROpF9EHWGGyvVOexC2PG5rbZbCg74P6O7O7YopO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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