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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbcc1ec249ed368ffdf992db890a3325c6f90fbc8c4837d990fe1f4c0d29eae' 
  AND token = 'QF5k8Lvp9wlfQpNKIPLnJSl2sBD2+q9otQpibkVFR5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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