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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38623b27ccb35bd803a797bcaf56a8400bdc78a36d6df35006fbb9152fd5d196' 
  AND token = 'vztSvZpzFIfD31PmCOJ3PIABMDjPN9E0aXmRvYnTImA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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