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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd394347c09ea064d21c2073774607b82340846e1f17e3377300adb48af5ffacd' 
  AND token = 'am69b4k8ACXfwK34KJ9Lwtp4hjnnatAjaUjbEtqG1Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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