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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa1b2c4dae82e24d5d1111bb7cdd3e22e996f1a460401cd3fed5b877ec27e1b' 
  AND token = 'SGP34WDgF8aSUsIZxmaytiJSHrNQkVrCX9RV+qtrsdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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