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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39b96c351da1499fd4c41a99b9e14893b561806036b0d70bcdef43e4a7bc17e' 
  AND token = '9mkx5j+z/PFWqJxevRZaL6Mqlz37hRD6yURAwsMtK24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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