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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8942ba5fe9b20695f53a27d556ea96530b7fd6fb1717439750fbf9b1be273515' 
  AND token = '3GFDrbhfQV6V9Rec0LGCEP5D9gFwsP94UTzUrJfYvjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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