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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b862404cbbed10bee8cdd932b91bcd74d6494d9d16c0c9570b0401fbf539d8' 
  AND token = 'X6iHQaiIsIbYQyTrmMBCPL8F6k19yiHL4hyJUkWPvO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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