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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0079d0570da7e337679a358a55eb191fd351ad986d0b63d24b7bd89770e35ab2' 
  AND token = 'N5eT05LeTFP0lqKPF10p6hhIIhjg/Hag79W+Gr1CM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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