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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae06729cc6b9c487c64a2a18a187da75c5a9ec27d2a3d0dca53ebc369c7f9a78' 
  AND token = 'bzbZyFcYmGZ/Wg9JcIQV8CkS248qHibhrtxU39zq/SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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