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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98566e06af7c0b163931d981d9bcfa5ab892c38ecfea3ca38542cffc108f3acc' 
  AND token = 'm9oZDxLnB/YaYs51WWgQgmwXu/4sfGyNufpiy5FgKeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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