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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5885356a2b33d4313e009267ea31f598efd95a813a6997557c5097151e5bf192' 
  AND token = '+K88whsrBO32f7L2MSAl2Sq/bniBlOQZfvdNRYnj53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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