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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb664afb111c1f80b58a43db62436736b118ae16485994ae0611c4cb07bdd3a' 
  AND token = '5cSxdjN8uondh1Fjtzm+QgONiNL5ktOaFyP+dIZdtBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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