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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bb12b303472e81424604672f27fd09f178ebeaaa5215dc6242ab6e3f5a07b5' 
  AND token = '2iKn7mHdsC7ZIaL5jFk01+Zqp7W8TTz9woPi+bOGZeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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