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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e5b6deb539234398b605c775b3d6b2ff89f7cd7512c2496692471063d4af42' 
  AND token = 'DuPQyjGz3nCYwlhej5LbX1o87hfu/okXlRc8Ea/i560=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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