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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4c224bbf5ca220551d37a721a60c716255717bc123b0fc750352efc5031f42' 
  AND token = '8bWquUMQPlFgiMbmmb5iQfqW2ALAJtREWxyYK+ZqKYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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