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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445e54b19cb4439999fdb403acfd74d1835f1f038034b812c1a78aeff41f0372' 
  AND token = 'w+yN71Vk5OuW5ClgG+y/uBE+WOe7w6Hd1832RRqbxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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