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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e753f74ff0d4e577fb1d28c583ae3b975083b899b346b4ad16967fd30b1d6a07' 
  AND token = '5Se3hJrxVWxV0K8xXAGD3pZUN4uJy1rDJ7fBVOm3/tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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