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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a456e4828650f55ca7013ba1ea16d17491a1330d6f0c87518d285601191600' 
  AND token = 'GfqoxgB4MgDkiUraXiN6YXrMnjw9n3h6onjgOc9an0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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