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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74899d794cd393f6c41b5a473634234424fe6d007f4b27012538ee1be1f0b15' 
  AND token = 'WxxI+5PZWtFalVhka0JQ7r9IsJy9OSwgN7x9FNRyG4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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