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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0beaec34d47756da423cc42ebdce9d6ed39ee2704c9efc016a3b24dd3c19ab8' 
  AND token = 'P6Gi5d/EYb4QWGTVey3AxyVYxyNWX6TecQp5Yochz3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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