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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3364adb15e437610362f8b286c8db732192b08f94e8344cf93778d4a44e4525c' 
  AND token = 'xCi9x+Ql8Voc3N8h87XwukeQfAV0BIYpIVm/SkNVOEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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