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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ada66a1ced4cbd8a35d1b56699934ad618490ce4d506a08a080d0145867c71' 
  AND token = 'ij+WsIc8vQfSqeSDAz5eWWBHAl1MHSdyfoiFL6CpouM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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