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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3b11a4982e8c69dabd094d9a9a3623a1e1ba5df28933cf5f3f681bbf205c27' 
  AND token = 'RxswBc04BsUfsteTVNma4/8uZzd22fqQQ8J1kCMwHBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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