SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd44f1a3fea75bca7b25c6188f9c656e57d91713820e6499763e888d3f63cb93' 
  AND token = 'Jv2UiPjf6TqL1LQuN+wia4aMLlD3ZEqLHt9dRmXD1CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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