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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3341ef310fd188ad7fcd815164d1dc8cc09e66dcf401056c7db26f9dbab1654' 
  AND token = 'z6fOJY6WUMhFHfLwI0Zk5YPV6RnXqM38J5CKy1/t++U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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