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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1dd5e54017aa7491997d25ac444cd4842cd72bfeb9a969bdfd0c53d3129838' 
  AND token = 'D6zTwElZcQSa56BNrlbhiG1VaNxqy8YVSik4Ti8FSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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