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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ba02cfc458d9ad29a667ef0ed6f281934422bfba5caefc630df54dba80bbb1' 
  AND token = '2f1xst0S+way0slaTXF8y5W/6Kj+cisE3/zF9YMQFz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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