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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0031f956a159adcf759032d7757765dcad04ad8421abb86bb8bc76292e145729' 
  AND token = 'Xogzq2LADfQ+7watAsoNf3wtDiXd/oMmi7P/xwZ0vbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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