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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b73ee7a10434fcd2ebc1d3d5b954687f4cbe8a6422d5166c71cbc216e33876' 
  AND token = 'KNSwTLAtQrUV7G6gdJc2jyNZKxlIZUxbjgGOKxM6uO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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