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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b4f66340decf9e08998ceda118eb7198ce702c38967f775d0def7b8cf8c258' 
  AND token = 'LraeY9Bj5rFX9/yotDJC2BJwbfuRWoizaedosO3O4js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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