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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a73314b53207a00f731bdbbd7ca042bbf16a613d6df11ab8cd48ad18cfbaf0' 
  AND token = 'Ha9cJsL0oiHXm/3wVQyoQeX2Y4kGuiCqAYYCNz0JoyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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