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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de006392ac7b66aefd0168bd84879bd978763860b42857a4ab63893d2b0f1c57' 
  AND token = 'uc4AbuTThDeJ0X/RJtehDHZIUj5lkFLk//GwZOCGWOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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