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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabfbebc20d4009c339173530549c47e0a43e92c0ccea96744214dfb1e70502a' 
  AND token = 'EYZVVwLBiurgUMRuauEc7gecXJqjyq3+qd8dFf08C+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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