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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846df62fd510dcd43660d30b9dc7cc50f78e770283fa64e3b605d27ee96f18ca' 
  AND token = 'vi6zSoWvEKMRsL8Kko3gwm0/X1v76+w/YIPvHo54LSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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