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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e628bed39e45b7c5e7b76a3778a81304adad874aa5dc02a238d24e1ef159988e' 
  AND token = 'ffU6fGUOl/8ayfQ7XdPVcc4Zq/UyImn6I32VdimIe8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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