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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1748fbfacb9e2371ee2b2fc4c2c92c0701a15f66a5027b06de7461a1799422cc' 
  AND token = 'ku79epC3PXp5u8eaGhE7uM/Wd6H7SjsqQtWpn/DfPac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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