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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2006929c21368087a1a4fb34df2ab16a9f41b684c5d223abc17f41c4d1c998' 
  AND token = 'nvrAytjzKbVKyQIAFVlMyzdT0SO1npHoQKWXtCAY30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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