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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945bd43ddfad88d5c21eac3c36ecad26a9f08ec98e9d2710b701052adf03ed1b' 
  AND token = 'THs4KTHAFxio4HgfUIAOpuKVSQ1Vfw/np3bmpHr9Xdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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