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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9b475224b08e476515d320325803930207ad7ca8bc97a451d4dc555b4a302b' 
  AND token = '6m1zdy8tnZjG6lEZZ1LQwe9Z6fqu2fxbLl94AwPpJvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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