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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065c6ae762e450d8dcac634de76019036d3bba305541272a93f0980323319dec' 
  AND token = 'WTGxhtRnM6TLvBnyw12NHsIX6RE8NWjMF4K1t88JG00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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