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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fab5bfb1037f2c396f489b6f6d065df68ce53acec357108ddb73874f3ba9192' 
  AND token = 'orVur66qi6vFvXwiFg4T5mvlTXxMowS0xZZQXCeZTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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