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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa518eaa7a9a172b9169896f20ba48307a2dd33476adce1ecaa924e1695177c4' 
  AND token = '3/DWs13Od8ya23II1N2d89NOBAf/SDcTZr4BDBwkH8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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