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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c8fe883bd42af0bc9d6ec8320f293c3fad0444039b669f3d28d1d888a129f3' 
  AND token = 'LVYn7g71h+oRzlZhilD2WsQS6R2ZL/h0O9xdDPFiXOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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