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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044cf9b54a1747a62f6e5c7ce611b59b002f0a99ff3ba576be87d7926719da11' 
  AND token = 'Vu/4FspOvOy//3U+1CmaAQ72juU2HmzCncVDUd2p7oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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