SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72064f79d7d13b93aad1a0b5e0c6a6b4420220cf28456176adba7aa49898fe23' 
  AND token = 'hkdtkf28Mxtwdc6W3KHGkvpJU5jX+/unXZAqWf+G2Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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