SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564425f4b771f1e92788617886b52fa5bd97801346c82f281e985c19cead2202' 
  AND token = 'WB/Wqe8+mp1IS3g5YB8i8VfkrHY2hV77CxAGmB3sRwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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