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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3534d2147bf6066b2e2a3fa99476faa400099defcb021e78483a597f9f8022ed' 
  AND token = 'vcFl0KswzNEee9rxbjtLoPyXPugarAQMM0ElXKqkde8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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