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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54e5186f872a09d08b46c3272f03097e6029ef7b7bbc8b0be8230a78d386586' 
  AND token = 'kWlywRYgv4MUsd9GCu2TNLN9Wn5a8VKgtpiCMBp/I00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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