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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba52560b6ea54e939c4badcb376b3678355bc17d6f8b7c93e79b09332a0b90b' 
  AND token = 'sgcowwyP0HjCPnbVBVwFEgb2KzmtPl2N4WrBzjdA9pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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