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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a8274d5b835baed2c61f3a104b91559662e25fec22eb9222cfeb807b20b53b' 
  AND token = 'pTOJ8NjeyxoHUQ+T68IYm22WBU5GT2NmDyuHUZSfhUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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