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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b85b594f9c10f99f6730d9d5c5e3dec53d288048c4a35e8dd98353b143d059' 
  AND token = 'GND02PX50jU3gkQzxlY4ww0a4ZOa2qppIQc8StFCKVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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