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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79289a5fba7b53bc5dd3e00af71bca6766a96ef51cd08836eecf8fe05f1db636' 
  AND token = 'WLKMgmKGCJ7gDeAK9BKWCXb+Vq4llp9r67SSRuWtLik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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