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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ded7bda122cd08fe87c6a56168587619c9f49f212faaba612a5f8398c21c5c' 
  AND token = 'vBxnhEr07E75ZH2409OHV0MIRk3ZyaSoKtgpZ+8jJgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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