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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4ae140ce1454650e8e08780984e3fdee598fb94893bb459f29c9a4bb594aca' 
  AND token = 'eIcWxUJiiPm0TACYqFg1027vukqG9g98XQyRfeoBkF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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