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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ffb4b520fd4345752d928b4adeefdae2f9416c09bb61feb6f625f44e0f4f7e' 
  AND token = 'b2WxpWjn64o5aBPRnlnNq3sxfXwXGAjRZcofLIC+LuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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