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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2c3b11c53005887d7aff5347d8fbf6c8752a25c5926880036f04fdbdf6bd73' 
  AND token = 'Cxla603usoGfzLw/L8jk5/LBf/c4JzKi95BLme3OHpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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