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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfe0ca68117be285848cf8141c11c47541aa3c89b686054703956195966ec40' 
  AND token = 'll49Xh7KpS3kJcIUSXk8WKzLeMFZkdbNl5+BlmS/M2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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